英语选修6unit3语法【精选】
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It is about 5 kilograms. （指度量） It was very quiet in the café. (指环境) It is half an hour’s walk to the city centre (指距离)
How is it going? (指情形)
“It”用作“形式主语” （8）
Xi’an is a beautiful city, isn’t it? Is this your dog？No, it isn’t.
2. 指代性别不明的人（常指baby）/ 说话人不清 楚性别的人（常在打电话、敲门等时）:
eg. The baby cried because it was hungry. There is a knock at the door. It must be the
3. it + be + V.ed+ that从句.
“据… / 有人（人们）…”
It is reported that many people died in the earthquake.
It is suggested that the students (should) build up their strength.
1. it ：形式主语 2. it百度文库：形式主语 3. it：形式主语
to do ：真正主语（3） doing ：真正主语（1） that从句：真正主语（4）
一、
① it + be + adj. (+ for sb.）+ to do sth
“（对 sb.来说，）做某事是…的。”
It is important for us to learn English well
三、1. It + be + adj. + that从句.
It is very clear that he’s round and tall like a tree.
It is certain that everything will get on well due to our hard work.
It's kind of you to help me with the problem.
It’s generous(adj. 慷慨的) of you to donate su a large of money to charity.
（ 此处adj. 通常为描述“人”的形容词： brave, kind，unkind，nice，rude，considerate， careful，careless，silly，foolish，stupid，clever， wise，crazy.）
It is no wonder that you are breathless.
It is a pity /shame that he should get into the habit of abusing alcohol. （其中，当n.为a pity (a shame /an honor /a Surprise... 等表示出乎意料时，常译为“竟然”， 则 that 从句中的v.用虚拟语气，即should + do） 。 没有这种意义时，则不用虚
It is strange that he shouldn’t feel ashamed of his behavior. （当adj.为strange/surprising /natural/ important/necessary等时，that 从句中即 (should ) + do）
2. it + be + n. + that从句.
adj.：legal，illegal，polite，impolite， possible, impossible , clear，obvious， evident , certain，suitable，fit，useful， useless，etc.)
② it + be + adj. + of sb.+ to do sth.
Grammar
The use of “it”
it 真实身份大揭底 Ⅰ.用作人称代词 Ⅱ.用作非人称代词 Ⅲ .It 作形式主语 Ⅳ. It 作形式宾语 Ⅴ. It 用在特定句型中
Ⅵ. It 用在固定习语中
“It”用作“人称代词”
Ⅰ.用作人称代词
1. It 指代上文中提到的物、事。（简化语言，避免重复） eg. My pen is missing. I can’t find it.
milkman. 3. 代替上文中的指示代词this/that --Who is that over there? --It’s Helen.
“It”用作“非人称代词”
Ⅱ.用作非人称代词
“it”表示天气、时间、日期、距离、价值、度量、温度、 环境，季节，情况等（称为非人称的it）： It is a bit windy. (指天气) It was nearly midnight when she came back（. 指时间 It‘s May 1, 2007. （指日期） It is 150 yuan. （指价格） It is summer now. (指季节)
二、it + be + n./ adj. + doing sth.
t’s no use/useless doing sth 做某事是无用的
t’s no good/a waste of time/fun/worth doing sth
eg . It's no use crying over spilt milk. It's useless thinking too much. It's a waste of time playing computer games.
③ it + be + n. + to do sth.
“做某事（真）是个…” 常用n.有：good idea / a pity/ a shame等
It is a good idea to quit smoking before one comes pregnant.
It is a pity/shame not to see that scholar in the flesh.
How is it going? (指情形)
“It”用作“形式主语” （8）
Xi’an is a beautiful city, isn’t it? Is this your dog？No, it isn’t.
2. 指代性别不明的人（常指baby）/ 说话人不清 楚性别的人（常在打电话、敲门等时）:
eg. The baby cried because it was hungry. There is a knock at the door. It must be the
3. it + be + V.ed+ that从句.
“据… / 有人（人们）…”
It is reported that many people died in the earthquake.
It is suggested that the students (should) build up their strength.
1. it ：形式主语 2. it百度文库：形式主语 3. it：形式主语
to do ：真正主语（3） doing ：真正主语（1） that从句：真正主语（4）
一、
① it + be + adj. (+ for sb.）+ to do sth
“（对 sb.来说，）做某事是…的。”
It is important for us to learn English well
三、1. It + be + adj. + that从句.
It is very clear that he’s round and tall like a tree.
It is certain that everything will get on well due to our hard work.
It's kind of you to help me with the problem.
It’s generous(adj. 慷慨的) of you to donate su a large of money to charity.
（ 此处adj. 通常为描述“人”的形容词： brave, kind，unkind，nice，rude，considerate， careful，careless，silly，foolish，stupid，clever， wise，crazy.）
It is no wonder that you are breathless.
It is a pity /shame that he should get into the habit of abusing alcohol. （其中，当n.为a pity (a shame /an honor /a Surprise... 等表示出乎意料时，常译为“竟然”， 则 that 从句中的v.用虚拟语气，即should + do） 。 没有这种意义时，则不用虚
It is strange that he shouldn’t feel ashamed of his behavior. （当adj.为strange/surprising /natural/ important/necessary等时，that 从句中即 (should ) + do）
2. it + be + n. + that从句.
adj.：legal，illegal，polite，impolite， possible, impossible , clear，obvious， evident , certain，suitable，fit，useful， useless，etc.)
② it + be + adj. + of sb.+ to do sth.
Grammar
The use of “it”
it 真实身份大揭底 Ⅰ.用作人称代词 Ⅱ.用作非人称代词 Ⅲ .It 作形式主语 Ⅳ. It 作形式宾语 Ⅴ. It 用在特定句型中
Ⅵ. It 用在固定习语中
“It”用作“人称代词”
Ⅰ.用作人称代词
1. It 指代上文中提到的物、事。（简化语言，避免重复） eg. My pen is missing. I can’t find it.
milkman. 3. 代替上文中的指示代词this/that --Who is that over there? --It’s Helen.
“It”用作“非人称代词”
Ⅱ.用作非人称代词
“it”表示天气、时间、日期、距离、价值、度量、温度、 环境，季节，情况等（称为非人称的it）： It is a bit windy. (指天气) It was nearly midnight when she came back（. 指时间 It‘s May 1, 2007. （指日期） It is 150 yuan. （指价格） It is summer now. (指季节)
二、it + be + n./ adj. + doing sth.
t’s no use/useless doing sth 做某事是无用的
t’s no good/a waste of time/fun/worth doing sth
eg . It's no use crying over spilt milk. It's useless thinking too much. It's a waste of time playing computer games.
③ it + be + n. + to do sth.
“做某事（真）是个…” 常用n.有：good idea / a pity/ a shame等
It is a good idea to quit smoking before one comes pregnant.
It is a pity/shame not to see that scholar in the flesh.